Rick Santorum tried to spin his primary losses into a positive light on Tuesday, saying he's beginning the "second half" of his GOP presidential campaign.

The former Pennsylvania senator spoke after Maryland and Washington D.C.'s contests went to his rival Mitt Romney but before the race was called in Wisconsin -- the most competitive primary of the night.

Romney won that state too, pushing the former Massachusetts governor past the half-way mark in his quest for the 1,144 delegates needed to clinch the Republican nomination.

To read more on this story at The Hill go to  http://thehill.com/video/campaign/219843-santorum-on-losses-were-beginning-the-second-half